can't find the OPENAI_API_KEY variable

In my app.openia project I set that variable but when deploying it I get the error of

[Nest] 27 - 02/17/2025, 12:34:02 AM ERROR [ExceptionHandler] The OPENAI_API_KEY environment variable is missing or empty; either provide it, or instantiate the OpenAI client with an apiKey option, like new OpenAI({ apiKey: 'My API Key' }).

I'm using the nest framework and from there I access the variable like this:

apiKey: process.env.OPENAI_API_KEY

I hope you can help me with this problem, thanks.

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